Type Locality:

Tay Mountain, Anvil Range, Yukon Territory.

Distribution:

Thickness unknown. Anvil Range, Tay River map-areas - through Kalzas Mountain of the Glenlyon map-area northwestward into the Mayo map-area (map 890-A) and southeastward into the Tay River map-area where it is mapped as Unit #7. It lies to the northeast of the Tintina Trench.

Lithology:

The two main rock types are grey and greenish-grey andesitic and dioritic rocks and dark grey argillite, slate and phyllite, some of the latter may properly belong to older breccias and agglomerates. Minor amounts of dark grey shaly limestone, green and reddish argillite, pale green and grey chert, chlorite schist, dark grey and brown quartzite, and soft carbonaceous shale are also present.

Relationship:

Partly unconformable and partly in fault contact with the underlying Earn Gp. Relationship to overlying units unknown. In the Glenlyon map-area, the Tintina fault forms the southwestern boundary of the group. As mapped, the group includes Lower Paleozoic strata which, with adequate study and subdivision, would not be included within it. Tempelman-Kluit (1972) states "The Anvil Range Group is correlated with similar cherty and volcanic rocks in adjacent map-areas which have previously been dated as Mississippian or younger on indirect stratigraphic evidence, and included in a general way with extensive Devono-Mississippian clastic rocks. Specifically, units in Selwyn Basin roughly correlative with the Anvil Range Group, are: map-unit 6 on Wheeler, Green, and Roddick (1960a, 1960b); map-unit 7 of Poole, Green, and Roddick (1960); map-unit 13 of Blusson (1966), map-unit 8 of Gabrielse (1967b); map-unit 15 of Campbell (1967). Rocks of the Anvil Range Group were previously mapped by Roddick and Green (1961a; our ref. 1961b) in the present area as unit 8 and tentatively assigned a Mississippian or younger age. Campbell (1967) has suggested the possible equivalence between his Anvil Range Group rocks and Permo-Triassic volcanic strata in southwestern Glenlyon map-area."

History:

Tempelman-Kluit (1972) noted that the Anvil Range Gp of R.B. Campbell (1967) included strata of probable Cambrian, Pennsylvanian and Permian age and that there was a break between the phyllitic and volcanic rocks. Therefore, he redefined the Anvil Range Gp to include only strata of volcanic affinity and of Late Paleozoic age. The group as redefined includes three unnamed but distinctive, mappable formations. These include: a lower unit (8a) of chert, pale green, greenish brown, light brown and locally brick red, massive to thin bedded laminated, variably argillaceous and tuffaceous (610 m, 2,000 ft); a middle unit (8b) of volcanic rocks including basaltic rocks, tuffs, massive amygdaloidal flows, pillowed basalts, massive flows and pyroclastic rocks (460 m, 1,500 ft); and an upper member (8c) limestone dense, massive, buff and light grey bioclastic, thickness unknown.

Other Citations:

Blusson, 1966; H.S. Bostock, 1947; R.B. Campbell, 1967; Gabrielse, 1967b; Poole, Green, and Roddick, 1960; Roddick and Green, 1961b; Tempelman-Kluit, 1972; Wheeler, Green, and Roddick, 1960a, 1960b.

References:

Blusson, S.L., 1966. Geology, Frances Lake, Yukon and District of Mackenzie (105H); Geological Survey of Canada, Preliminary Map 6-1966.

Campbell, R.B., 1967. Geology of Glenlyon map-area, Yukon Territory (105L); Geological Survey of Canada, Memoir 352, 92 p.

Gabrielse, H., 1967b. Watson Lake, Yukon Territory; Geological Survey of Canada, Preliminary Map 19-1966, Scale: 1 Inch to Four Miles (1:253 440).

Tempelman-Kluit, D.J., 1972. Geology and origin of the Faro, Vangorda, and Swim Concordant zinc-lead deposits, central Yukon Territory: Geological Survey of Canada, Bulletin 208, 73 p.

Wheeler, J.O., Green, L.H., and Roddick, J.A., 1960a. Geology, Quiet Lake, Yukon Territory; Geological Survey of Canada, Preliminary Map 7-1960, Scale: One Inch to Four Miles = 1:253 440, NTS: 105F.

Wheeler, J.O., Green, L.H., and Roddick, J.A., 1960b. Geology, Finlayson Lake, Yukon Territory; Geological Survey of Canada, Map 8-1960, Scale: One Inch to Four Miles = 1:253 440, NTS: 105G.